An unusual cause of diarrhoea

Clinical presentation

A 70 year old Caucasian female presented with a six month history of intermittent diarrhoea, abdominal pain, and weight loss of 3 stone. Routine blood tests and liver ultrasound were normal.

Question

What abnormalities do the computed tomography scan (fig 1 ▶) and histology slide (fig 2) demonstrate? What was the cause of her diarrhoea?

Figure 1.

 Computed tomography scan of the abdomen.

See page 1713 for answer

This case is submitted by: